This one from the University of Massachusetts, Lowell:

The [national] poll, released on Wednesday, says a more than three out of four people surveyed favor a requirement of more-through background checks prior to gun purchases, including in-depth psychological exams, and for closing the “gun-hole loophole” that allows purchases at gun shows without the same types of background checks with other gun sales.

The survey had 78 percent in favor of increased background checks and 80 percent favoring closing the gun-show loophole.

Sixty percent support the banning of sales of assault-type weapons.

I suspect that this one will be quoted from a lot by the anti-gun media.

Complete poll results here.